EMI Analysis And Structural Optimization Design Of SVG Power Unit

SVG for its large running range good controllability, energy efficient features, in recent years in the domestic distribution network and grid field has been more applications.SVG is the core of control compensation breaking power unit module. As a result of the design of the bridge SVG AC circuit in the power unit will be based on extensive use of capacity and other high current IGBT modules. IGBT module with driver board and the control panel are installed in a small volume of space. And the modules are arranged relatively close alignment of the power unit requires a lot of copper. IGBT-off time will be greatly du/dt and di/dt, resulting in a very strong power unit internally generated magnetic field. IGBT switching work is at a very high frequency operation of the trigger circuit inevitably affected by the surrounding magnetic interference. Engineering practice many failures are due to electromagnetic interference during IGBT switching control circuit damage caused by accident, so this article is about how to reduce the main content and inhibition of key components SVG line when the IGBT off electromagnetic interference generated discussion. Through their work experience and theoretical study proposes a reasonable approach to design.This paper analyzes the SVG runtime operating characteristics of the IGBT, the IGBT off when the electromagnetic fields generated by modeling a reasonable basis. Through theoretical analysis and electromagnetic compatibility introduction of domestic and foreign development provides a theoretical basis for the modeling.In this paper, the work carried out in three areas:1.SVG key components of the power unit carried out the selection. Device functionsbased on customer requirements, the power unit of the IGBT model, rectifier diodes, capacitors, DC side of the selection.2. Reduce electromagnetic interference power unit. The key components of the power unithrough IGBT module analyzes thefactors that produce mold interferenc e analyzes, andprovides a solution.3.For the presence of interference shielding optimized. Combined with work experience position SVG modules were susceptibletointerference shielding optimi zation in placeprone to stray inductance increases the absorption of the program.